target/linux/brcm2708/patches-4.1/0205-Input-add-support-for-FocalTech-FT6236-touchscreen-c.patch

   1 From 75a6299867667a481a12f3c833322e39ff4fb089 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
   3 Date: Fri, 2 Oct 2015 11:30:11 -0700
   4 Subject: [PATCH 205/222] Input: add support for FocalTech FT6236 touchscreen
   5  controller
   6 MIME-Version: 1.0
   7 Content-Type: text/plain; charset=UTF-8
   8 Content-Transfer-Encoding: 8bit
   9
  10 This adds support for the FT6x06 and the FT6x36 family of capacitive touch
  11 panel controllers, in particular the FT6236.
  12
  13 Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
  14 Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
  15 ---
  16  .../input/touchscreen/focaltech-ft6236.txt         |  35 +++
  17  .../devicetree/bindings/vendor-prefixes.txt        |   1 +
  18  drivers/input/touchscreen/Kconfig                  |  13 +
  19  drivers/input/touchscreen/Makefile                 |   1 +
  20  drivers/input/touchscreen/ft6236.c                 | 327 +++++++++++++++++++++
  21  5 files changed, 377 insertions(+)
  22  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/focaltech-ft6236.txt
  23  create mode 100644 drivers/input/touchscreen/ft6236.c
  24
  25 --- /dev/null
  26 +++ b/Documentation/devicetree/bindings/input/touchscreen/focaltech-ft6236.txt
  27 @@ -0,0 +1,35 @@
  28 +* FocalTech FT6236 I2C touchscreen controller
  29 +
  30 +Required properties:
  31 + - compatible            : "focaltech,ft6236"
  32 + - reg                   : I2C slave address of the chip (0x38)
  33 + - interrupt-parent      : a phandle pointing to the interrupt controller
  34 +                           serving the interrupt for this chip
  35 + - interrupts            : interrupt specification for the touch controller
  36 +                           interrupt
  37 + - reset-gpios           : GPIO specification for the RSTN input
  38 + - touchscreen-size-x    : horizontal resolution of touchscreen (in pixels)
  39 + - touchscreen-size-y    : vertical resolution of touchscreen (in pixels)
  40 +
  41 +Optional properties:
  42 + - touchscreen-fuzz-x    : horizontal noise value of the absolute input
  43 +                           device (in pixels)
  44 + - touchscreen-fuzz-y    : vertical noise value of the absolute input
  45 +                           device (in pixels)
  46 + - touchscreen-inverted-x : X axis is inverted (boolean)
  47 + - touchscreen-inverted-y : Y axis is inverted (boolean)
  48 + - touchscreen-swapped-x-y: X and Y axis are swapped (boolean)
  49 +                           Swapping is done after inverting the axis
  50 +
  51 +Example:
  52 +
  53 +       ft6x06@38 {
  54 +               compatible = "focaltech,ft6236";
  55 +               reg = <0x38>;
  56 +               interrupt-parent = <&gpio>;
  57 +               interrupts = <23 2>;
  58 +               touchscreen-size-x = <320>;
  59 +               touchscreen-size-y = <480>;
  60 +               touchscreen-inverted-x;
  61 +               touchscreen-swapped-x-y;
  62 +       };
  63 --- a/Documentation/devicetree/bindings/vendor-prefixes.txt
  64 +++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
  65 @@ -76,6 +76,7 @@ everspin      Everspin Technologies, Inc.
  66  excito Excito
  67  fcs    Fairchild Semiconductor
  68  firefly        Firefly
  69 +focaltech      FocalTech Systems Co.,Ltd
  70  fsl    Freescale Semiconductor
  71  GEFanuc        GE Fanuc Intelligent Platforms Embedded Systems, Inc.
  72  gef    GE Fanuc Intelligent Platforms Embedded Systems, Inc.
  73 --- a/drivers/input/touchscreen/Kconfig
  74 +++ b/drivers/input/touchscreen/Kconfig
  75 @@ -295,6 +295,19 @@ config TOUCHSCREEN_EGALAX
  76           To compile this driver as a module, choose M here: the
  77           module will be called egalax_ts.
  78
  79 +config TOUCHSCREEN_FT6236
  80 +       tristate "FT6236 I2C touchscreen"
  81 +       depends on I2C
  82 +       depends on GPIOLIB || COMPILE_TEST
  83 +       help
  84 +         Say Y here to enable support for the I2C connected FT6x06 and
  85 +         FT6x36 family of capacitive touchscreen drivers.
  86 +
  87 +         If unsure, say N.
  88 +
  89 +         To compile this driver as a module, choose M here: the
  90 +         module will be called ft6236.
  91 +
  92  config TOUCHSCREEN_FUJITSU
  93         tristate "Fujitsu serial touchscreen"
  94         select SERIO
  95 --- a/drivers/input/touchscreen/Makefile
  96 +++ b/drivers/input/touchscreen/Makefile
  97 @@ -36,6 +36,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI)                += eeti_
  98  obj-$(CONFIG_TOUCHSCREEN_ELAN)         += elants_i2c.o
  99  obj-$(CONFIG_TOUCHSCREEN_ELO)          += elo.o
 100  obj-$(CONFIG_TOUCHSCREEN_EGALAX)       += egalax_ts.o
 101 +obj-$(CONFIG_TOUCHSCREEN_FT6236)       += ft6236.o
 102  obj-$(CONFIG_TOUCHSCREEN_FUJITSU)      += fujitsu_ts.o
 103  obj-$(CONFIG_TOUCHSCREEN_GOODIX)       += goodix.o
 104  obj-$(CONFIG_TOUCHSCREEN_ILI210X)      += ili210x.o
 105 --- /dev/null
 106 +++ b/drivers/input/touchscreen/ft6236.c
 107 @@ -0,0 +1,327 @@
 108 +/*
 109 + * FocalTech FT6236 TouchScreen driver.
 110 + *
 111 + * Copyright (c) 2010  Focal tech Ltd.
 112 + *
 113 + * This software is licensed under the terms of the GNU General Public
 114 + * License version 2, as published by the Free Software Foundation, and
 115 + * may be copied, distributed, and modified under those terms.
 116 + *
 117 + * This program is distributed in the hope that it will be useful,
 118 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
 119 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 120 + * GNU General Public License for more details.
 121 + */
 122 +
 123 +#include <linux/delay.h>
 124 +#include <linux/gpio/consumer.h>
 125 +#include <linux/i2c.h>
 126 +#include <linux/input.h>
 127 +#include <linux/input/mt.h>
 128 +#include <linux/interrupt.h>
 129 +#include <linux/module.h>
 130 +#include <linux/property.h>
 131 +
 132 +#define FT6236_MAX_TOUCH_POINTS                2
 133 +
 134 +#define FT6236_REG_TH_GROUP            0x80
 135 +#define FT6236_REG_PERIODACTIVE                0x88
 136 +#define FT6236_REG_LIB_VER_H           0xa1
 137 +#define FT6236_REG_LIB_VER_L           0xa2
 138 +#define FT6236_REG_CIPHER              0xa3
 139 +#define FT6236_REG_FIRMID              0xa6
 140 +#define FT6236_REG_FOCALTECH_ID                0xa8
 141 +#define FT6236_REG_RELEASE_CODE_ID     0xaf
 142 +
 143 +#define FT6236_EVENT_PRESS_DOWN                0
 144 +#define FT6236_EVENT_LIFT_UP           1
 145 +#define FT6236_EVENT_CONTACT           2
 146 +#define FT6236_EVENT_NO_EVENT          3
 147 +
 148 +struct ft6236_data {
 149 +       struct i2c_client *client;
 150 +       struct input_dev *input;
 151 +       struct gpio_desc *reset_gpio;
 152 +       u32 max_x;
 153 +       u32 max_y;
 154 +       bool invert_x;
 155 +       bool invert_y;
 156 +       bool swap_xy;
 157 +};
 158 +
 159 +/*
 160 + * This struct is a touchpoint as stored in hardware.  Note that the id,
 161 + * as well as the event, are stored in the upper nybble of the hi byte.
 162 + */
 163 +struct ft6236_touchpoint {
 164 +       union {
 165 +               u8 xhi;
 166 +               u8 event;
 167 +       };
 168 +       u8 xlo;
 169 +       union {
 170 +               u8 yhi;
 171 +               u8 id;
 172 +       };
 173 +       u8 ylo;
 174 +       u8 weight;
 175 +       u8 misc;
 176 +} __packed;
 177 +
 178 +/* This packet represents the register map as read from offset 0 */
 179 +struct ft6236_packet {
 180 +       u8 dev_mode;
 181 +       u8 gest_id;
 182 +       u8 touches;
 183 +       struct ft6236_touchpoint points[FT6236_MAX_TOUCH_POINTS];
 184 +} __packed;
 185 +
 186 +static int ft6236_read(struct i2c_client *client, u8 reg, u8 len, void *data)
 187 +{
 188 +       int error;
 189 +
 190 +       error = i2c_smbus_read_i2c_block_data(client, reg, len, data);
 191 +       if (error < 0)
 192 +               return error;
 193 +
 194 +       if (error != len)
 195 +               return -EIO;
 196 +
 197 +       return 0;
 198 +}
 199 +
 200 +static irqreturn_t ft6236_interrupt(int irq, void *dev_id)
 201 +{
 202 +       struct ft6236_data *ft6236 = dev_id;
 203 +       struct device *dev = &ft6236->client->dev;
 204 +       struct input_dev *input = ft6236->input;
 205 +       struct ft6236_packet buf;
 206 +       u8 touches;
 207 +       int i, error;
 208 +
 209 +       error = ft6236_read(ft6236->client, 0, sizeof(buf), &buf);
 210 +       if (error) {
 211 +               dev_err(dev, "read touchdata failed %d\n", error);
 212 +               return IRQ_HANDLED;
 213 +       }
 214 +
 215 +       touches = buf.touches & 0xf;
 216 +       if (touches > FT6236_MAX_TOUCH_POINTS) {
 217 +               dev_dbg(dev,
 218 +                       "%d touch points reported, only %d are supported\n",
 219 +                       touches, FT6236_MAX_TOUCH_POINTS);
 220 +               touches = FT6236_MAX_TOUCH_POINTS;
 221 +       }
 222 +
 223 +       for (i = 0; i < touches; i++) {
 224 +               struct ft6236_touchpoint *point = &buf.points[i];
 225 +               u16 x = ((point->xhi & 0xf) << 8) | buf.points[i].xlo;
 226 +               u16 y = ((point->yhi & 0xf) << 8) | buf.points[i].ylo;
 227 +               u8 event = point->event >> 6;
 228 +               u8 id = point->id >> 4;
 229 +               bool act = (event == FT6236_EVENT_PRESS_DOWN ||
 230 +                           event == FT6236_EVENT_CONTACT);
 231 +
 232 +               input_mt_slot(input, id);
 233 +               input_mt_report_slot_state(input, MT_TOOL_FINGER, act);
 234 +               if (!act)
 235 +                       continue;
 236 +
 237 +               if (ft6236->invert_x)
 238 +                       x = ft6236->max_x - x;
 239 +
 240 +               if (ft6236->invert_y)
 241 +                       y = ft6236->max_y - y;
 242 +
 243 +               if (ft6236->swap_xy) {
 244 +                       input_report_abs(input, ABS_MT_POSITION_X, y);
 245 +                       input_report_abs(input, ABS_MT_POSITION_Y, x);
 246 +               } else {
 247 +                       input_report_abs(input, ABS_MT_POSITION_X, x);
 248 +                       input_report_abs(input, ABS_MT_POSITION_Y, y);
 249 +               }
 250 +       }
 251 +
 252 +       input_mt_sync_frame(input);
 253 +       input_sync(input);
 254 +
 255 +       return IRQ_HANDLED;
 256 +}
 257 +
 258 +static u8 ft6236_debug_read_byte(struct ft6236_data *ft6236, u8 reg)
 259 +{
 260 +       struct i2c_client *client = ft6236->client;
 261 +       u8 val = 0;
 262 +       int error;
 263 +
 264 +       error = ft6236_read(client, reg, 1, &val);
 265 +       if (error)
 266 +               dev_dbg(&client->dev,
 267 +                       "error reading register 0x%02x: %d\n", reg, error);
 268 +
 269 +       return val;
 270 +}
 271 +
 272 +static void ft6236_debug_info(struct ft6236_data *ft6236)
 273 +{
 274 +       struct device *dev = &ft6236->client->dev;
 275 +
 276 +       dev_dbg(dev, "Touch threshold is %d\n",
 277 +               ft6236_debug_read_byte(ft6236, FT6236_REG_TH_GROUP) * 4);
 278 +       dev_dbg(dev, "Report rate is %dHz\n",
 279 +               ft6236_debug_read_byte(ft6236, FT6236_REG_PERIODACTIVE) * 10);
 280 +       dev_dbg(dev, "Firmware library version 0x%02x%02x\n",
 281 +               ft6236_debug_read_byte(ft6236, FT6236_REG_LIB_VER_H),
 282 +               ft6236_debug_read_byte(ft6236, FT6236_REG_LIB_VER_L));
 283 +       dev_dbg(dev, "Firmware version 0x%02x\n",
 284 +               ft6236_debug_read_byte(ft6236, FT6236_REG_FIRMID));
 285 +       dev_dbg(dev, "Chip vendor ID 0x%02x\n",
 286 +               ft6236_debug_read_byte(ft6236, FT6236_REG_CIPHER));
 287 +       dev_dbg(dev, "CTPM vendor ID 0x%02x\n",
 288 +               ft6236_debug_read_byte(ft6236, FT6236_REG_FOCALTECH_ID));
 289 +       dev_dbg(dev, "Release code version 0x%02x\n",
 290 +               ft6236_debug_read_byte(ft6236, FT6236_REG_RELEASE_CODE_ID));
 291 +}
 292 +
 293 +static void ft6236_reset(struct ft6236_data *ft6236)
 294 +{
 295 +       if (!ft6236->reset_gpio)
 296 +               return;
 297 +
 298 +       gpiod_set_value_cansleep(ft6236->reset_gpio, 1);
 299 +       usleep_range(5000, 20000);
 300 +       gpiod_set_value_cansleep(ft6236->reset_gpio, 0);
 301 +       msleep(300);
 302 +}
 303 +
 304 +static int ft6236_probe(struct i2c_client *client,
 305 +                       const struct i2c_device_id *id)
 306 +{
 307 +       struct device *dev = &client->dev;
 308 +       struct ft6236_data *ft6236;
 309 +       struct input_dev *input;
 310 +       u32 fuzz_x = 0, fuzz_y = 0;
 311 +       u8 val;
 312 +       int error;
 313 +
 314 +       if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 315 +               return -ENXIO;
 316 +
 317 +       if (!client->irq) {
 318 +               dev_err(dev, "irq is missing\n");
 319 +               return -EINVAL;
 320 +       }
 321 +
 322 +       ft6236 = devm_kzalloc(dev, sizeof(*ft6236), GFP_KERNEL);
 323 +       if (!ft6236)
 324 +               return -ENOMEM;
 325 +
 326 +       ft6236->client = client;
 327 +       ft6236->reset_gpio = devm_gpiod_get_optional(dev, "reset",
 328 +                                                    GPIOD_OUT_LOW);
 329 +       if (IS_ERR(ft6236->reset_gpio)) {
 330 +               error = PTR_ERR(ft6236->reset_gpio);
 331 +               if (error != -EPROBE_DEFER)
 332 +                       dev_err(dev, "error getting reset gpio: %d\n", error);
 333 +               return error;
 334 +       }
 335 +
 336 +       ft6236_reset(ft6236);
 337 +
 338 +       /* verify that the controller is present */
 339 +       error = ft6236_read(client, 0x00, 1, &val);
 340 +       if (error) {
 341 +               dev_err(dev, "failed to read from controller: %d\n", error);
 342 +               return error;
 343 +       }
 344 +
 345 +       ft6236_debug_info(ft6236);
 346 +
 347 +       input = devm_input_allocate_device(dev);
 348 +       if (!input)
 349 +               return -ENOMEM;
 350 +
 351 +       ft6236->input = input;
 352 +       input->name = client->name;
 353 +       input->id.bustype = BUS_I2C;
 354 +
 355 +       if (device_property_read_u32(dev, "touchscreen-size-x",
 356 +                                    &ft6236->max_x) ||
 357 +           device_property_read_u32(dev, "touchscreen-size-y",
 358 +                                    &ft6236->max_y)) {
 359 +               dev_err(dev, "touchscreen-size-x and/or -y missing\n");
 360 +               return -EINVAL;
 361 +       }
 362 +
 363 +       device_property_read_u32(dev, "touchscreen-fuzz-x", &fuzz_x);
 364 +       device_property_read_u32(dev, "touchscreen-fuzz-y", &fuzz_y);
 365 +       ft6236->invert_x = device_property_read_bool(dev,
 366 +                                                    "touchscreen-inverted-x");
 367 +       ft6236->invert_y = device_property_read_bool(dev,
 368 +                                                    "touchscreen-inverted-y");
 369 +       ft6236->swap_xy = device_property_read_bool(dev,
 370 +                                                   "touchscreen-swapped-x-y");
 371 +
 372 +       if (ft6236->swap_xy) {
 373 +               input_set_abs_params(input, ABS_MT_POSITION_X, 0,
 374 +                                    ft6236->max_y, fuzz_y, 0);
 375 +               input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
 376 +                                    ft6236->max_x, fuzz_x, 0);
 377 +       } else {
 378 +               input_set_abs_params(input, ABS_MT_POSITION_X, 0,
 379 +                                    ft6236->max_x, fuzz_x, 0);
 380 +               input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
 381 +                                    ft6236->max_y, fuzz_y, 0);
 382 +       }
 383 +
 384 +       error = input_mt_init_slots(input, FT6236_MAX_TOUCH_POINTS,
 385 +                                   INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
 386 +       if (error)
 387 +               return error;
 388 +
 389 +       error = devm_request_threaded_irq(dev, client->irq, NULL,
 390 +                                         ft6236_interrupt, IRQF_ONESHOT,
 391 +                                         client->name, ft6236);
 392 +       if (error) {
 393 +               dev_err(dev, "request irq %d failed: %d\n", client->irq, error);
 394 +               return error;
 395 +       }
 396 +
 397 +       error = input_register_device(input);
 398 +       if (error) {
 399 +               dev_err(dev, "failed to register input device: %d\n", error);
 400 +               return error;
 401 +       }
 402 +
 403 +       return 0;
 404 +}
 405 +
 406 +#ifdef CONFIG_OF
 407 +static const struct of_device_id ft6236_of_match[] = {
 408 +       { .compatible = "focaltech,ft6236", },
 409 +       { }
 410 +};
 411 +MODULE_DEVICE_TABLE(of, ft6236_of_match);
 412 +#endif
 413 +
 414 +static const struct i2c_device_id ft6236_id[] = {
 415 +       { "ft6236", },
 416 +       { }
 417 +};
 418 +MODULE_DEVICE_TABLE(i2c, ft6236_id);
 419 +
 420 +static struct i2c_driver ft6236_driver = {
 421 +       .driver = {
 422 +               .name = "ft6236",
 423 +               .owner = THIS_MODULE,
 424 +               .of_match_table = of_match_ptr(ft6236_of_match),
 425 +       },
 426 +       .probe = ft6236_probe,
 427 +       .id_table = ft6236_id,
 428 +};
 429 +module_i2c_driver(ft6236_driver);
 430 +
 431 +MODULE_AUTHOR("Sean Cross <xobs@kosagi.com>");
 432 +MODULE_AUTHOR("Noralf Trønnes <noralf@tronnes.org>");
 433 +MODULE_DESCRIPTION("FocalTech FT6236 TouchScreen driver");
 434 +MODULE_LICENSE("GPL");